your lenses 14-42 will be 28-84 mm. and the 40-150 will be 80-300mm. That means that you have all focal lengths from 28-300mm.
So you have everything, but not a wideangle yet (if you need it, though)
So... my 40-150 is equlivilant to a 80-300mm ......
but if i put a "film camera lens" that is 100-200 mm on my DSLR it will give a focal length of 200-400mm ?
I just want to knowas i was looking for a FAST lens but in the 40-80mm range...so that means the older lens would need to be 20-40mm .... right ?!??!